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1 10W Rx COIL FOR LOW FREQUENCY WIRELESS POWER TRANSFER Product Name Wireless Charging Antenna Coil -10w low frequency receive Molex PN Part Description Wireless Charging Coil - 10w low frequency receive REVISION: B ECR/ECN INFORMATION: TITLE: EC No: DATE: 2016/12/28 10W Rx COIL FOR LOW FREQUENCY WIRELESS POWER TRANSFER SHEET No. 1 of 5 DOCUMENT NUMBER: CREATED / REVISED BY: CHECKED BY: APPROVED BY: AS Benson Liu 2016/12/28 Ryan Liu 2016/12/28 Welson Tan 2016/12/28
2 10W Rx COIL FOR LOW FREQUENCY WIRELESS POWER TRANSFER FEATURES CoolSkin TM for highest PCB/Flex Q Factor Smartphone and accessory form factor Industry leading thinness of 0.63mm MAX (w/shield) Enables high efficiency solutions Flex PCB construction: Increased durability Repeatable performance Integration with other electronics Custom design available Molex Part Number Inductance 200kHz (uh) Electrical Parameters at 25 o C DCR +/- 2% (mohm) ESR +/- 2% (mohm) Typical End-End Efficiency 1 (%) Coil Thickness Mechanical Parameters (mm) Assembly Thickness (w/shield) Material > MAX Flex 1 End to End Efficiency is typical and will depend on Power Amplifier, matching circuit, device configuration, charging distance and other factors. Please contact Molex directly if further guidance is required; www. Molex.com or via phone at MOLEX ( ).
3 1.0 SCOPE This specification describes a FPCB receiver coil for wireless power transfer at frequencies 100kHz to 300kHz. The information in this document is for reference and benchmark purposes only. The user is responsible for validating coil performance based on users own testing environment. 2.0 PRODUCT This high efficiency coil is designed for high performance mobile phones, handheld mobile terminals or any other device / accessory requiring up to 10W power out. Standard FPCB construction enables integration with other electronics, high durability, and consistent performance. 2.1 SPECIFICATIONS AND DEFINITIONS Equivalent Series Resistance (ESR): resistance measured at or around the operating frequency. ESR accurately characterizes any losses such as skin effect or proximity effect and any additional effects that may occur in the presence of material such as shielding, metal backing, or the housing. Comparison of coil assembly and in situation ESR measurements can accurately determine sources of loss. This metric should be given serious consideration during product selection to ensure full characterization of system electrical parameters. Direct Current Resistance (DCR): resistance measured at DC or measured at very low frequencies (60 Hz Hz) and is often considered an incomplete measurement in wireless charging environments because it does not take into account actual causes of resistance during operation. NuCurrent recommends ESR as the most relevant measurement of resistance in a wireless power coil, but provides DCR values as well. 2.2 PRODUCT TUNING Tuning is a critical aspect that greatly impacts system performance. The receiver coil should be placed in the final housing, placed on desired charging surface, and have situational inductance, Ls, measured. The necessary tuning capacitor values can be calculated using Equation 1: = *It is important to note that the equation above should be used as reference, and for additional tuning information, please check appropriate system datasheets for further information. For detailed product specific tuning information, please contact Molex at or via phone MOLEX ( ). 2.3 PERFORMANCE For custom applications, Molex and NuCurrent can optimize antenna assemblies for thickness, price or efficiency. The data below demonstrates the performance of the coil up to 10W.
4 Test Equipment used for all tests 10W transmitter 10W 7V/1.4A out Coil assembly (coil and shield) 2.4 SCHEMATIC 2.5 GENERAL INFORMATION a. Wireless Charging receiver coil applicable for low frequency devices b. For Rx applications up to 10W c. Includes shielding for low frequency wireless charging d. High quality (Q) factor coil e. Durable, repeatable, easily integrated, robust solution
5 3.0 REFERENCE DOCUMENTS 4.0 PROCEDURE 4.1 GENERAL REQUIREMENTS A. CONNECTIONS FOR TESTING I. 28AWG copper wire recommended for through-hole soldering B. RECOMMENDED TEST SETUP
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